Finding the Fourth Proportional to 1,479.72, 2,220.89 and 862.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,479.72 : 2,220.89 = 862.58 : x
2. Step 2: Convert to fraction form
   1,479.72/2,220.89 = 862.58/x
3. Step 3: Cross multiply
   1,479.72x = 2,220.89 × 862.58
4. Step 4: Simplify right side
   1,479.72x = 1,915,679.88
5. Step 5: Solve for x
   x = 1,915,679.88/1,479.72
6. Step 6: Final answer
   x = 1,294.62